The screenshots say it all:
Latest gen StreetView mapping cars have:
1. LIDAR scanners
2. Thermal imagers
The cars will not only collect data that will allow for better 3D models of buildings, but will also be able to create a rough map of the internal layout of the building.
A professor from Harvard University, Dr. A. Phooles (who has a BS in Privacy Public Relations) indicated the tactic of previewing this technology could be effective. He anticipates this new Street View technology won't be released until one year from today.
read more about the technology at: http://www.gearthblog.com/blog/archives/2009/04/google_previews_next_generation_str.html